Tubular lighting device

Abstract

A tubular lighting device comprising an elongated heat sink (3), at least one light source (5) mounted on the elongated heat sink (3), and an elongated hollow tubular member (7) with a first and a second end arranged along the elongated heat sink (3). The tubular member (7) comprises a lens (15) and a light exit surface (9). The light exit surface is located in front of the lens (15) and the light exit surface (9) have at least one diffusing portion (11) with a transparent portion on each side of each diffusing portion. The at least one diffusing portion (11) covers an area on the light exit surface (9) corresponding to a light distribution of said lens (15) projected on the light exit surface (9), such that all light is directed by said lens (15) onto the at least one diffusing portion (11).

Description

FIELD OF THE INVENTION[0001]The present invention generally relates to a tubular lighting device, and more specifically to a tubular lighting device with improved illumination features for retrofit fluorescent lamp fixtures.BACKGROUND OF THE INVENTION[0002]Today, the interest in developing and improving alternative lighting devices has greatly increased due to the removal of incandescent light bulbs on the market. This has further lead to increased demands on reduced production costs and to increase the performance of the alternative lighting devices. For example, lighting devices with light emitting diodes have several advantages compared to other conventional lighting, including for example high energy efficiency, high light output and long service life. Therefore, light emitting devices have also started to be incorporated into tubular lighting devices, replacing the traditional fluorescent tubes commonly found in offices, and other general places.[0003]However, the use of light ...

AI Technical Summary

Benefits of technology

The patent text describes a new type of tubular lighting device that can scatter light more evenly, resulting in a more uniform light output. This is achieved by incorporating a diffusing portion in the tube, which receives direct and indirect light from the LEDs and mixes it to create a more complete lighting. By designing a lens with a narrow light distribution angle, the ratio between the diffusing portion and the transparent parts can be improved, resulting in the desired light output distribution. This invention and its unique design can provide a more complete and consistent lighting effect.

Problems solved by technology

However, the use of light emitting diodes in general lighting is generally associated with problem relating to unsatisfactory illumination distribution, such as uneven light distribution, glaring light and spottiness.

Persons exposed to this type of lighting may be affected negatively by for example being forced to peer or otherwise risk eye strain to compensate for the unsatisfactory illumination.

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